Most likely you'll need to do thiscode:
$updatefile = '"KB823980\WindowsXP-KB823980-x86.exe" /u /q /f'
Run '%comspec% /c Runas /user:DOMAIN\MSUpdate '+$updatefile
However,the update file path looks incomplete to me, better use a complete pathname incl.drive/share.
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There are two types of vessels, submarines and targets.
